All editing of file data and map modifications are conducted from within the central Editing menu. Most functions use four field coding system. Some old functions use six field system.
When editing, each function requires confirmation of changes, either with the Do button or another command. However, no changes are updated to the disk file until the file is saved. There are separate functions for each type of edit (points, lines, texts, etc.). With these you can easily modify the data.
N.B. editing can be done in 3D mode. In certain instances, like vertical lines or stacked points, this is very useful.